Ignore the thought and go to bed.

Putting the thought out of your mind, you continue home.

You don't sleep well and wake up feeling awful, both physically and emotionally.

It's too early to call Sarah so you try to keep busy with other things. You make yourself breakfast but find you don't have much appetite so you spend a few hours cleaning your apartment. It's not something you do often so there's plenty of work to keep you occupied until the afternoon.

Finally, after you've run out of obvious chores, you pick up your phone and open the recent calls. Naturally, Sarah's number is at the top of the list. You nervously hover your finger over the call button.